<!DOCTYPE html>

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>叠加</title>
        <style type="text/css">
            .wrapper { border: 1px solid grey ; width: 80% ; margin: 100px auto ; }
            .box {
                margin: 50px ;
                background-color: #1e9fff;
                padding-top: 1px ;
                padding-bottom: 1px ;
            }

            .content {
                margin: 25px ;
                background-color: #FFFF00;
                height: 100px ;
            }
        </style>
    </head>
    <body>

        <div class="wrapper">
            <div class="box">
                <div class="content"></div>
            </div>
        </div>
        
    </body>
</html>